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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd413618467a86eb9f0b043282c0861e472dee0965443b1d8aa8fcc5c58966854' 
  AND token = '3hxUUyD8/GMvjF2eSxUXmBzeLR/fL4fsf2+eLr3hVVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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