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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370cabc417068498a91108f9c65441a20b160b82f9220ff1d1cec2e2c12ee18e' 
  AND token = '2yp8SMW5fmhHOwqYz2ficmAeqqov7MhupfDSbDnOKIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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