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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84146d4518e6492b721669b9de766712fb149eb87d6c59c62ed2f75e9b302d4' 
  AND token = 'L2vsOn2+R5tvJfQKTerMwAZyL3Q9q9I3inogZ4wS0o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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