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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9e2b66f3521af75fe360bf4c5ccf7defeda55fd4012626b141e65a5b11b4b2' 
  AND token = 'cxpoZAC8UcdF2u/h4r7pFAm1FX5quCNp3KmjGDOvI+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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