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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f8a0cc88709d2512dd941095f73d802b2a848c8f7ac47219a75eca0043ddbb' 
  AND token = 'Q3md9BzZngCUhdNfxP0EzZQi2QYxx/AOxiMMDNLC9Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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