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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2964a7ea3c958454870cc95e43d435d3f53319f2cbbd709d1d34091cdfd20548' 
  AND token = '0w9GOzOA8oo9hE9MLbMYANXmYA+zCs34hx+Y8q9PY38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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