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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5996ced84a5ff572eeacc2cbd246ae1ca14e46f489f2542aa753fc7e4c3e474a' 
  AND token = '/CYvbxGBozb4kso8JdvFPAHE782Hj75ioZQEY94Ol3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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