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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214468ea8f453803c9136e0d6fe2320bfe47c1c96a6f63e50d79b6b491dabb4a' 
  AND token = '5Dh598b89bwh77mroUzv7SsOoJ6IcPVeZwBOnCpBdmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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