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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f802c86acd85e7fcf12fc85064972322b912a556ee479f0b582a6dba9c1b56' 
  AND token = '6L+TvkYPjBMHcs7bKM6OQWDTMqL4Q2giM8IvVRztfmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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