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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e812fb4bae436cfa44886e69179c20e2282452a6e1c4aecd044b683d5e9b0ada' 
  AND token = 'KHyYE0sGKcD0f3kUf4d32jEd+UzqSU6I8uLL9cMeELQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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