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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b2c010e515810e0a1a59fe6e19f1ceff2cfbee26e64368bab08a6a78f206a8' 
  AND token = 'O8NuqrDGt6O1/cYyx5kmkiHqL2bMVamaJJMH4J+a1hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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