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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3ced34f78d772edf9bb274b3123ce5c9d892f599d3f822fe1286476da37c09' 
  AND token = '8a2c0JJVPMN28kxCADwW/oxB92h3+Z/Wd7lrnQBiuGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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