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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aea8800eb3edc092b9120c59ec3a55f88b40a7b88761a5ae192b7f4e4906270' 
  AND token = '/ZAF91nYh+3EW4nphjhdauyNH19NSXkM1TZqRM6UCAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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