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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f3302420f82061526414c121a3c7a2853290398b6be5c6cc4dcd9caab29222' 
  AND token = 'm0s9ZAJzRwuzn00j0tEULx18DxwWKaRY1v1L635QebY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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