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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8631b6b335bffe40beb40a190b9196cb7a7d8bf98bb05119f2a2703bf74559f' 
  AND token = 'DsjUACiI7rLDgZpG/Y6uEU3cXMgW20CKvKW7sgMKD90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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