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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd88cdc10430f704a888e4a95a2c59706ac038a3fa99ba9f3c884508aa144e0a' 
  AND token = '9bHyYtIRjQP9dKCGiEB9P4plJ6/LfhLJ/RIF1yPJG/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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