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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f1e4fa83a93e77c139a65e9b6839b82bfc14b4392382de041a6e4281d2215f' 
  AND token = 'T6bYkE2uL1W1k74X9Ubz/R9q7kxRkILpH0IUjkdSyoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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