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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '380aac01cd56d8799533fd95f0810d1a4abc51ab79d5e9d49858b485590daa1f' 
  AND token = 'Y8h2OnXCUCd/LamMoJNnEgaJkDE3JyOk9y1tBnzTL5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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