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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31eec2c53253e2f32e440c6826bee2682da7fe843120b80988b574eae69aa427' 
  AND token = 'v2x88OdAQ7hYcJGCTKiomCPAe3cdFN/v+/TJJ5WTj+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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