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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb77405ed432c2fcb34e15b6cffb185958b09f989ed2ae574ec2e2e676d7dba' 
  AND token = 'kLYf3U97IPE172l5HjK6J2SC60ZMyDf33r+wwo5caQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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