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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1c943cbb9e3f36977e23e4a42d2a0b9f29bec7fa6804affe42ae4e87db4f4d' 
  AND token = 'sUODL7uJE35pv8cmtutT+oFYFNab8Z1+jjzl9YGXWP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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