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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b7cbae3f5581fcea31a40a7d14e33cd9fdfb595d3aaad2b0fc64c0e792b5d45' 
  AND token = 'A/fiXOviQ3kbuP5aKmj7k/Ffju0/ONhWFICKmx9tWfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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