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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e93f5d47c3ac154a4d05291fcac6948e964ec2ce22572bbec0df1cc0c7315d' 
  AND token = 'IQSldEBedhraXA5pdsA4Nd0+AV18P1VyAosz158NnC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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