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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1a305c2bdfb9d419f433b8344f24c954105d45fac45a6a0881961341d794cf' 
  AND token = 'FgUn6qdFHgwqImeGmbcuE2g4JHm7Lbk8g+Kc/aqKIhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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