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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3cd692fefa6109f8ad33520de5f63ca4c191ee46f040c0ac57b1961b1100b4' 
  AND token = 'rWIDa97g6wSChliGcjH2apjoKfY8UnEg17oFZf0BG+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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