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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1cdf2e5713557eb971e27f19f7bdcb81da511e550289f28a5c3afceb24d8c9' 
  AND token = 'jvtNNuirpdCbASCIgUKYOsSzFnY7iV/nH7Wt33uxSg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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