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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a4b7cf8587587b7de9aed0590e5e85f5bd0db506d76e49ee30505e93b0a50b' 
  AND token = 'pW5LA5d9mzd9pnGyaK4gXCS3drMh+JCqQGCWoNrfzD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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