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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e075d08dbee00dfb0748e6d8554e84c452dfc316b4c28ca65bd8f68afb4933' 
  AND token = '3GlMrf6ixEQw6nrFTNPu08XSCKW+sztl0+b0rxkDNfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}