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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9e5b595e45ed0164de5612f6aeea4dba6832299f79780af60ce16d15752983' 
  AND token = '5wbr13kgO0xLx4J3c9hSjtMUXiu1Y5uT4Lbm2wLchi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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