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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace76b2432b089e1a4ae3ed631338088fc61f0eb98db23e283e438ea317af9d2' 
  AND token = 'W5v0JVByVDBHinl/8Pm3wL2UQp2anI52RKmIZaovk+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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