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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc71ae1c648b3cf3d5592fcaf1f7c4011a3e3cffc59fd50f6e5b0d4892cb50d' 
  AND token = 'NT1qFRnPmYR4jusw9iZTEnHnjOnF2x054vQbqnr/Ulo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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