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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6231447b354c39f03c9121ab7b5d2c52f0038e10830f3bc977ade8912ede6e3' 
  AND token = 'hJ+W8oeTdofs/aBM6z+kZ+b5iMbUTGu6obfVP/A9oJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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