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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908f42ec579f4b6b03223c8a5ec10d8234f0c3cc368b51ddb6c4779dd23ef267' 
  AND token = 'LVVgku5tIlBdJZNieY4ZA+Br+/FRXmD5cbBn9oPab3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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