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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8341451aed3d10cd22a0b8a7ccced1736ad477dc62c9fbcf7e34eb3eff6ed3d8' 
  AND token = 'rGVXY61v4MdNvIfz/Y03PXFvRbUnJUfgFGs4CouZ3fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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