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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c620e2be3eea91149edc1cd4c2bc6d0dd0ef38d4e2936bc667c6904feadf16' 
  AND token = 'ieJAU13O+m+rJtsjHP1Oc7GNd4T5lX1C/JC3hURNqac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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