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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b491d12254d27e17d06d78ad8d8f0392db40bf7b0f12ea06c0ddb3c39d29b937' 
  AND token = 'TQ36ospOruJJKZU0LO6E2zjnv7AI+Z53cGsUi4pCplc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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