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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0047f8d63c7630900e8f3328b826217bc42f8e82432e2b2871c46713761f126e' 
  AND token = 'DxD4K2nJEwXZiIhC3/U4N8Bp1dGkO0CnuBjN3JRZQ1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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