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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69692cd810af736aea9f8e1732e03a2ad56769323a0b3295f7333f120c6c7865' 
  AND token = 'R7XhcEN09fyJQABG2Gbk4JPplJ6YH66jlDdlpGTdJTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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