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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070e71797dd9088de26ed8e93238a89b92fd2825efc49be770e896445208f640' 
  AND token = '1WgKZf6CftOzT839DZ8QlsOScUc1N52WSWkh0MHe8BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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