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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6686b4eb5683109b8558631380d06278c9953cfe06141d8645a5e7999dffb1' 
  AND token = 'pA+C5oj4c069svbMj4cSLvboQ/89/tBGc9twtSQLEhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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