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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d283ebf36b1e35624361eff8123575ba373a0ab0d4784cc8f76fc1f7c9c0ace' 
  AND token = 'XJ7OCGueVCW2PttkRUA05ZysariAsHZN3EgGRGyk//k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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