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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68620ccdd34eeea10050966738c2a82d74a4e0c4d99d20eee9608c6fee55a31' 
  AND token = 'X3yvN4QTVBOJAdAV+YXwzisfqVyJlvTy63GbI1tmI8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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