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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef216174c834e94536bc1976e9538f5eec9182fbcb09937cec466e254eba33db' 
  AND token = '2qbMxqMjx8IAERAHySSE4L+stvUF4BjhSuoo+cPvb/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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