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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd128b498d6f87e2a01f77b52390566695f64105d4c55a16a6c7fa325b29c07ac' 
  AND token = 'ewB1G4uHyKaW/b3hUR1ycJYBa6uWrdkwzGvuNM672cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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