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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b664b03e35724affed365f0d39c9c20aebdd58b4e3ff9052eb39c336174cb285' 
  AND token = 'AtdcNXd9cWudNUTg23ZiWG6pkTXTya/VuYrd5peebzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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