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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0cd8027bd0406bf18c6a7ea072f762eddd846c5372915e6149f30af6fe14f8' 
  AND token = 'ihux7q+X2u73lw1zMf+TFI9nMOdN5DSAXIVfL9ns5pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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