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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcc82cd4c7ca869a925d306effd9a0e89f293cabbb6e01f2fe8cca88d942d45' 
  AND token = 'fa6g6J3o5nhxPhTe6TNDnrka/H1a50oktPS13bEilEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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