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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9abb173140569f1cf6293420f7933b124d7d3a2ed7d7ada08faa09c99182cfc' 
  AND token = 'WbJOUctfcrqCW8YGQsLs1ji/B1kRKG2gr59cjj8vzyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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