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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886ddc8f56eba77050eb350aef6266fb1e6c3a5548b7ae5db5a2e3bf0a26fe9d' 
  AND token = '0pAPxcz6JlEIuHIcfb/LZUqtVMjDbWCi/8d7Wk1SqGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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