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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fadd3bbfd1b8c0a1d2218a5b79c05140e799e4ebf4df2e0ef7751cc9f01ede62' 
  AND token = 'AquwMpQVXe2+CIMrX6IY5Zht6UUuwUJ11rbrWJ9Gl5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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