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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9b33a52b023fdd3678cab7d7f358b8ecbfba40560b9382dbed7e218378cea6' 
  AND token = '19Od1CpOPWnq6B882xR+oNMpqonEVojIa+n0OcbUbaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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