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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3466b56b55ef43b63af4f9071a2f92af42cf6ac6705642dc52977a0fcd3a04c4' 
  AND token = 'oTeSihTRTAIQeuWZzY9a/xKYeeAIk23VnZ+Yxc7YybQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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