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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab13fe226c14ff8ee128cb72364aeaaf7a459167afb93c9369620e32429c09b' 
  AND token = 'NEPtpWzsqcfKJ1qvtR8QJqU3G61MEOswnKroSQ3StZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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