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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca170c6b569375118795e911264cbfbbe6325a30f3a735afab2114ba905e716' 
  AND token = 'puxdD6qWKa5u3CL6Lx4oiSqPPcBocZnt6Se9iR6l/XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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