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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13516327b019223a6751e0adb84e7d92437146cd8d67b6d6636adb996549f92' 
  AND token = 'PMc1wwP0FqXKbBAkkTOQYVo38a5cDKX8lL0fjpIy4Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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