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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4712ecf0c8e22bdb872c820d89df15fee7a56650837712ca45c514834840c3d' 
  AND token = 'FGN2UzxLgYWWlQ8MtnW1CUbjHMU3+ZIUnP0hNuvwEFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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