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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3abf13f92334ac36e18d465a615f6f4bc5d116ad1974d90b22d982ad56acdd7' 
  AND token = 't6p9tsQi/Z7kSQmRIYOfYhqMuh0M54ukuzOd2OAinnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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