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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e734f41d8d87719ff5ac4e663766720951783cd5a29d0c93f9e792aac57e67e0' 
  AND token = 'XjG3iRWz5b52nt9lUCO8XJnF3oNEL+wGEb1YmmEX/68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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