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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237232120f4cebba5f7fb587fe31c90d8b26736118f8534eb947850c10625cc1' 
  AND token = 'wsl8np1CLR2ztBx5uWhUC3GfR8ZzOZI9zMmlwBpSecs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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