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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe056d8eb6e845e2e0820507529c283449d3f4e0d3c294a95d803e39531eafd4' 
  AND token = 'gC35RioCNL1pDOf3/TE+cCKyuFVxlKzb7zVRBdP3Lxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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