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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38af4d87442da4bb0f8bdffe4d99d04a6024ac1b1fff1f739798b0e7634d42c8' 
  AND token = 'y3UqDBU4LCsKKIKDw3GlW0qXWGf4CML8PXbRPNNiAtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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