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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62e91d8903ab3919d7ad273de16c48883b2363ad2efb2f4b0277054647de744' 
  AND token = '6BCIMH2NvxPNneicp4bK1r3mI1t254esTJVB9K/WE70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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