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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac574b04d8abccf89f1f53a2908003b771493dd40ea638ea162b87b3b52fb567' 
  AND token = 'PQqFOVn/bqe00SagRf6En/y+FUI4IgSrvrRY83V197o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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