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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c73201e4b754e2aee97ed19fcb178ce309e7c3a7d9b34da3abdb7dedf04d9f6' 
  AND token = '3aQ1OpeBFZm3u+JvnXsT2f/Q9OcWBoBukORF88RSHsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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