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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5f1d96eb11fdeda0ca446ec3847041db0ad88b770471c55d698579a3b3ae56' 
  AND token = 'm5BtSvob059QNNM3e4k4VbGrCe0GeI2fiGNkYc9tpME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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