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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62fa2246edd465516613c346853cf3e3af23d2c5b5aac60d332ecc61b9cc2c8e' 
  AND token = 'Y2y2W35f6+KdbUPsn52M+2Y8tVYEL0KEYwf8meEpuPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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