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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb26d7157706a04663051b2fcc19a8a28e48e76fcdad80aa7ab81cfb307d4d41' 
  AND token = 'pRvjzhrpFa73R9v2vrUqn4aDW0u1aR7vkXakUyAL1Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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