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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f08efe36b366b02025be754f68430bc8978f5e921a6c5984d228924362c5a4c' 
  AND token = 'bsRgFpjyWPFt0yS45QbFm7GrdsoyowYtUYwtU3VSp4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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