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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b11e9672a402d5b3b6c21ce8228d2d90029565d083de1aada3097ced58ab777' 
  AND token = 'fqBANo3H13wGZvogbR/PZavXJoW3Kn1xj9sTMOKYAw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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