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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4285de35cd6acffe0f822203a13652be35d7da2edc1c6f8e0ccb320832f0bf4' 
  AND token = 'psFw0W8oFvivewqroAEvHHC3DPHI8tD80OrgJS5nJ8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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