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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb4744eabe545731fd730a7d5f6d9c320e3bb372c4d59d7f4afdcb1e5d2f5d0' 
  AND token = 'eqmmOCgaXoLUNqrf83wsg8XfjpkyglA/vx9xaWVbj0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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